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Accounts Receivable, Net of Allowance (Details) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Mar. 31, 2020
Current assets      
Accounts receivable–billed $ 526,500   $ 474,822
Accounts receivable–unbilled 999,497   988,634
Allowance for doubtful accounts (4,452)   (3,985)
Accounts receivable, net of allowance 1,521,545   1,459,471
Other long-term assets      
Accounts receivable–unbilled 63,016   62,600
Total accounts receivable, net 1,584,561   $ 1,522,071
Provision for doubtful accounts $ (30) $ 1,900